iotests: Add preallocated resize test for raw

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170613202107.10125-16-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/tests/qemu-iotests/106 b/tests/qemu-iotests/106
new file mode 100755
index 0000000..3264957
--- /dev/null
+++ b/tests/qemu-iotests/106
@@ -0,0 +1,92 @@
+#!/bin/bash
+#
+# Test preallocated resize of raw images
+#
+# Copyright (C) 2017 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=mreitz@redhat.com
+
+seq=$(basename $0)
+echo "QA output created by $seq"
+
+here=$PWD
+status=1	# failure is the default!
+
+_cleanup()
+{
+	_cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment and filters
+. ./common.rc
+. ./common.filter
+
+_supported_fmt raw
+_supported_proto file
+_supported_os Linux
+
+# in kB
+CREATION_SIZE=128
+GROWTH_SIZE=256
+
+echo '=== Testing image growth ==='
+
+for create_mode in off falloc full; do
+    for growth_mode in off falloc full; do
+        echo
+        echo "--- create_mode=$create_mode growth_mode=$growth_mode ---"
+
+        IMGOPTS="preallocation=$create_mode" _make_test_img ${CREATION_SIZE}K
+        $QEMU_IMG resize -f "$IMGFMT" --preallocation=$growth_mode "$TEST_IMG" +${GROWTH_SIZE}K
+
+        expected_size=0
+        if [ $create_mode != off ]; then
+            expected_size=$CREATION_SIZE
+        fi
+        if [ $growth_mode != off ]; then
+            expected_size=$((expected_size + $GROWTH_SIZE))
+        fi
+
+        actual_size=$($QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" | grep 'disk size')
+        actual_size=$(echo "$actual_size" | sed -e 's/^[^0-9]*\([0-9]\+\).*$/\1/')
+
+        # The actual size may exceed the expected size, depending on the file
+        # system. Therefore we just test that the actual size is at least what
+        # we expect.
+        if [ $actual_size -lt $expected_size ]; then
+            echo "ERROR: Image should have at least ${expected_size}K, but has ${actual_size}K"
+        fi
+    done
+done
+
+echo
+echo '=== Testing image shrinking ==='
+
+# None of this should work except for "off", because other modes cannot be used
+# for shrinking
+for growth_mode in falloc full off; do
+    echo
+    echo "--- growth_mode=$growth_mode ---"
+    $QEMU_IMG resize -f "$IMGFMT" --preallocation=$growth_mode "$TEST_IMG" -${GROWTH_SIZE}K
+done
+
+# success, all done
+echo '*** done'
+rm -f $seq.full
+status=0